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A voltage-dependent chloride channel fine-tunes photosynthesis in plants

Journal article
Authors Andrei Herdean
Enrico Teardo
Anders K. Nilsson
Bernard E. Pfeil
Oskar N. Johansson
Renata Unnep
Gergely Nagy
Otto Zsiros
Somnath Dana
Katalin Solymosi
Garab Gyözö
Szabo Ildiko
Cornelia Spetea
Björn Lundin
Published in Nature Communications
Volume 7
Issue artikel nr 11654
ISSN 2041-1723
Publication year 2016
Published at Department of Biological and Environmental Sciences
Language en
Links www.nature.com/ncomms/2016/160524/n...
Keywords plant, chloride channel, photosynthesis, chlroplast, thylakoid membrane, variable light, photoprotection
Subject categories Biological Sciences

Abstract

n natural habitats, plants frequently experience rapid changes in the intensity of sunlight. To cope with these changes and maximize growth, plants adjust photosynthetic light utilization in electron transport and photoprotective mechanisms. This involves a proton motive force (PMF) across the thylakoid membrane, postulated to be affected by unknown anion (Cl−) channels. Here we report that a bestrophin-like protein from Arabidopsis thaliana functions as a voltage-dependent Cl− channel in electrophysiological experiments. AtVCCN1 localizes to the thylakoid membrane, and fine-tunes PMF by anion influx into the lumen during illumination, adjusting electron transport and the photoprotective mechanisms. The activity of AtVCCN1 accelerates the activation of photoprotective mechanisms on sudden shifts to high light. Our results reveal that AtVCCN1, a member of a conserved anion channel family, acts as an early component in the rapid adjustment of photosynthesis in variable light environments.

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